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Thanks all, Fingers crossed the PRV in the boiler is ready to start doing it's job once I cap off this old spring valve :)

Thanks for the quick replies. Having looked on the BES website, it says the pressure is adjusted by turning the external nut. So how do I know what pressure it's set to? The system is a sealed system hooked to a Worcester Combi (24CDi) which has a PRV built in. Does that suggest I don't need...

Hi, Can anyone tell me what this is? It's in the Central Heating return pipe. My guess, it's a pressure relief valve. I keep losing pressure and the drip is a clue to the culprit but I can't find anything like it on-line. Ta